English Reference

Word

geologist

Phoneticsge·ol·o·gist, stress on the second syllable

US/dʒiˈɑɫədʒəst/

UK/dʒɪˈɒlədʒˌɪst/

Countable noun Geology

Definition

n. a scientist who studies the Earth, including the rocks it is made of and how they change over time. They look at things like mountains, volcanoes, and fossils to understand the planet's history.

n. a scientist who studies the solid, liquid, and gaseous matter that constitutes the Earth and other terrestrial planets, as well as the processes that shape them. Focuses on the physical structure and substance of the Earth, its history, and the processes which act on it.

Examples

“The geologist examined the rocks to find out how old they were.”

“After the earthquake, a geologist arrived to study the fault line and assess the risk of future tremors.”

“By analyzing the mineral composition of the core samples, the geologist was able to reconstruct the environmental conditions that existed in the region millions of years ago.”

Examples

simple

“The geologist examined the rocks to find out how old they were.”

contextual

“After the earthquake, a geologist arrived to study the fault line and assess the risk of future tremors.”

complex

“By analyzing the mineral composition of the core samples, the geologist was able to reconstruct the environmental conditions that existed in the region millions of years ago.”

Real-World Examples

“Geologists believe that this mass graveyard is the result of an enormous volcanic eruption—1,000 times larger than the 1980 Mount St.”
Phys.org 28 Aug 2026
“That’s a recipe for sending off mudflows every now and then,” says David Montgomery , a geologist at the University of Washington who was not involved in the study.”
Smithsonian Magazine 21 Jul 2026
“Over his career as a geologist and paleobotanist, he has excavated and studied fossil plants from latitude 62°S to 82°N.”
Smithsonian Magazine 13 May 2019

Etymology

From geology + -ist.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Word family

NOUN

geologist(B2)

Domain

Geology

This entry

Exam level
CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.B2 FirstIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.5.5–6.5TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 4.0–4.572–94TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.785–944
Frequency
Frequent
Level
B2 · Upper Intermediate
Updated

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English Reference